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4744649 |
Ophthalmological measuring apparatus
An ophthalmological measuring apparatus having a laser-slit projector unit for projecting a laser beam on a portion in a human eyeball, a microscope unit adapted for receiving and observing the...
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4740071 |
Subjective ophthalmic instrument
A subjective ophthalmic instrument has optotypes which are observed by the patient through a correcting lens system of adjustable refractive power. The subjective ophthalmic instrument further has...
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4732466 |
Fundus camera
An optical system for forming an image of the retina of the human eye. The system includes a rotating drum having transmission/receiving slit pairs formed thereon. The rotation of the drum scans an...
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4730917 |
Method and an apparatus for determining the refraction
The invention relates to a method for determining the refraction of the human eye. The retinal image of an object is imaged via a lens system into an object space and into an image plane which is...
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4712894 |
Ophthalmoscopic instrument having working position detecting means
Ophthalmoscopic instrument having working position detector. An object lens has an optical axis and is adapted to be positioned to confront a patient's eye at a working distance. The patient's...
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4712895 |
Ocular position measuring apparatus
An ocular position measuring apparatus comprising a pair of fixation marks capable of emitting visible flickering beams for being watched by patient, a first pair of half mirrors positioned between...
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4710003 |
Cornea shape measuring apparatus
In a cornea shape measuring apparatus wherein a chart for measurement is projected onto the cornea of an eye to be examined and the shape of the corneal reflection image thereof is detected through...
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4707090 |
Objective refractor for the eye
An objective refractor for the eye is disclosed in which knife-edge optics are utilized. The knife-edge optics cause characteristic illumination of the retina so that components of sphere and...
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4702596 |
Apparatus for measuring the refractive power of an optical system
An optical system to be inspected is scanned with slit-shaped illuminating beams. The beams from the optical system are received with two or more pairs of photoelectric converting elements and the...
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4679917 |
Device for measuring intraocular light scatter
A novel optical device and method for measuring intraocular light scatter in a human vision system of a subject is described which comprises first and second light sources of respective...
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4679921 |
Apparatus for eye examination
An eye-examining apparatus comprises a first positive lens unit, a negative lens unit, a second positive lens unit, a third positive lens unit and a target mark arranged in the named order from the...
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4678297 |
Ophthalmic instrument
An ophthalmic instrument for effecting eye measurement with an eye-measuring target mark projected onto an eye to be examined, includes a photodetector provided at a position optically conjugate...
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4676611 |
Method and apparatus for visual-evoked responses
In an apparatus for assessing visually-evoked response, wherein stimulus means are provided to present a variable visual pattern to an observer and analyzing means are provided to analyze scalp...
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4676612 |
Eye examining apparatus
An eye examining apparatus is disclosed which is capable of the accurate detection of any abnormality in the optical system of a patient's eye which might exist at any position of the eye, and also...
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4673265 |
Procedure and device for automatic refractometric measurement of the degree of ametropia of a human eye
This invention concerns a procedure and device for refractometric measurement of the degree of ametropia of a human eye. The device for this invention comprises a light-emitting source combined...
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4673264 |
Ophthalmic instrument having focus detecting mark projecting means
An eye fundus camera having an automated focus control system which includes a mark projecting system for projecting a focus detecting mark to the retina of a patient's eye to produce a mark image...
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4662731 |
Apparatus for examination of the innermost part of an eye
A microscope, whose ocular tubes receive light that is reflected by the blind spot or another selected portion in the innermost part of a human eye in response to illumination by a flash unit or a...
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4660945 |
Methods and apparatus for accommodation training
Methods and apparatus for performing accommodation training under clinical conditions are provided in accordance with the teachings of the present invention. An infrared optometer is employed to...
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4650302 |
Interferometric eye test method and apparatus
For purposes of eye examination, a method is provided for determining the presence or absence of structural anomaly in the retina. In this method, the surface of the retina (under zero stress or...
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4637700 |
Method and an apparatus for determining refraction of the human eye
The invention relates to an ophthalmologic method for determining the refraction of the eye with a high time resolution. For the measurement an object is imaged onto the retina. In the light...
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4632528 |
Method for determining refractive index of an object
Method for determining a refractive index of an object in which the object is illuminated with a slit pattern of illumination light to form an optical section of the section of the object and the...
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4620779 |
Ophthalmologic apparatus
An ophthalmologic apparatus has a projection system provided with a fixation object capable of being perceived by an examinee, the projection system being for projecting the fixation object upon a...
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4619505 |
Refractometry process and device for measuring the degree of ametropia, and especially the degree of astigmatism, of the eye
The invention concerns a process and device for measuring the degree of ametropia of an eye. The rays of a luminous source passes through a focussing lens and a test lens in order to create an...
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4618230 |
Visual stimulator
A visual stimulator for light stimulation of a subject's eyes to obtain electroretinogram, electro-oculogram or visually evoked potential responses. The stimulator comprises a light directing means...
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4614411 |
Microscope with correlatable fixation target
The invention contemplates a binocular ophthalmological operation microscope with an optical fixation mark defined as effectively a point source of light, at the output end of an optical-fiber...
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4591247 |
Eye refractometer
An eye refractometer comprising a measuring target projection optical system for projecting a measuring target image to the eye fundus of a patient's eye by means of a pair of beams of light from a...
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4552440 |
Apparatus for determination of potential visual acuity utilizing a slit lamp microscope
In order to determine the visual acuity in the human eye in the presence of cataracts or other opacities, a conventional slit lamp microscope having an illumination source, an aperture illuminated...
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4544246 |
System for producing selective stabilization of a portion of the retinal image
A system is provided for producing a stabilized visual scotoma or aperture which comprises means for projecting the image of a visual scene along a first optical path including first and second...
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4541697 |
Ophthalmic testing devices
Optical measuring and testing apparatus incorporates a holographically recorded, single-frequency, optically thin phase grating. When this phase grating is illuminated by a quasi-monochromatic,...
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4540253 |
Method and device for measuring eye refraction errors
A method and apparatus for measuring eye refraction errors in which a plurality of infrared patterns are projected onto an eye to be measured. The reflected light is directed onto corresponding...
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4540254 |
Keratometer having peripheral light entrance and exit paths
A keratometer is disclosed in which at least some of the light entrance and exit paths have both peripheral entrance and exit paths. Eye positional information and sphere, cylinder and axis...
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4533222 |
Eye examining instrument
An eye examining instrument comprises examining means disposed to project an examining light to and receive the light from the eye of a person to be examined; a casing for encasing said examining...
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4529280 |
Apparatus for subjectively measuring the refractive power of an eye
An apparatus for subjectively measuring the refractive power of an eye includes obliquely disposed beam splitter means, diaphragm means provided on the reflection optical axis of the beam splitter...
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4517963 |
Image-erecting barrel rotator for articulated optical arm
An articulated optical arm adapted to optically link an endoscopic telescope to a viewing station through a series of mechanically interhinged and optically intercoupled arm sections, the last arm...
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4493539 |
Method and apparatus for objective determination of visual contrast sensitivity functions
A method and apparatus for objectively determining the visual contrast sensitivity function of a human subject involves subjecting the vision of the human subject to a plurality of sine wave...
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4491398 |
Hand-held keratometer
A hand-held keratometer is formed of a handle mounting a circular ring of transparent material having a roughened surface to collect incident light and project a circle of light for use in...
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4490022 |
Apparatus for corneal corrective techniques
A quantitative corneascope for use with a surgical microscope in performing corrective techniques on the eye includes a pair of hinged image projection housing members movably mounted on each side...
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4478499 |
Operation microscope with fixation device
The invention contemplates an operation microscope which incorporates an eye-fixation feature to enable a patient's eye (under microscope observation) to precisely maintain infinity focus and...
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4465348 |
Apparatus for the subjective and objective determination of refraction
A compact apparatus for the subjective and objective determination of refraction of the eyes of a person. Two projection ray paths (6, 7), separated in space from each other, are provided, both ray...
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4447141 |
Vision testing system
A vision testing system is disclosed in which a collimated beam of coherent light waves is passed through a transparency of an object such as a grating, a Snellen letter or a portrait to produce...
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4444476 |
Objective refractometers
An objective refractometer which enables a doctor to visually conduct optical pointings by projecting onto the retina of a patient an image coming from at least one point light source. The image is...
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4432617 |
Eye refractive error measuring device
A device for measuring the refractive error of an eye in which refractive powers in a plurality of longitudinal directions are simultaneously measured with a high S-N ratio with a high accuracy. A...
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4431278 |
Eye examining apparatus
Improvements in an eye examining apparatus of the type having eye fixation mark means, eye refractive power measuring means and control means for moving an image of the fixation mark depending upon...
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4423931 |
Fundus camera accessory for analysis of the ocular fundus contour
An accessory is provided to enable the use of a fundus camera in the photogrammetric analysis of the ocular fundus contour. The accessory includes a stripe projector which projects an image of a...
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4421391 |
Auto eye-refractometer
An eye-refractometer includes an objective optic having a first optical path, an apertured mirror for dividing the first optical path into a second optical path and a third optical path, a mask...
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4413890 |
Instrument for object detection of ocular diseases
An apparatus for objectively detecting ocular disorders adapted to the expedient examination of uncooperative patients generally comprises structures for collimating light into two predetermined...
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4410243 |
Arrangement for test image rotation in refractometers
The invention relates to an arrangement for rotating test images in refractometers for physical determination of defects of sight of a patient's eye. The arrangement is based upon the coincidence...
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4410244 |
Retinal acuity testing device
Optical measuring and testing apparatus incorporating a holographically recorded, single-frequency, optically thin phase grating. When this phase grating is illuminated by a quasi-monochromatic...
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4410242 |
High-precision ophthalmometer which is independent of distance
An ophthalmometer measurement system employs two flat glass plates which move in opposite pivoted directions, to determine the distance between two mirror images on the cornea. The pivot...
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4408847 |
Refractory power measuring device
A refractory power measuring device for measuring the refractory power of the human eye or a lens. The device includes a target projecting optical system having two optical elements which are...
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